- C source and header files derived from non-distributed Yacc sources are
now removed by "make clean", not only by "make maintainer-clean".
+ - The py-compile script now accepts empty arguments passed to the options
+ `--destdir' and `--basedir', and complains about unrecognized options.
+ Moreover, a non-option argument or a special `--' argument terminates
+ the list of options.
+
- A developer that needs to pass specific flags to configure at "make
distcheck" time can now, and indeed he's advised to, do so by defining
the developer-reserved makefile variable AM_DISTCHECK_CONFIGURE_FLAGS,